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Journal of Virology, December 2007, p. 13254-13258, Vol. 81, No. 23
0022-538X/07/$08.00+0 doi:10.1128/JVI.01018-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Department of Urology, Faculty of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8655, Japan
Received 10 May 2007/ Accepted 4 September 2007
To examine the mode of transmission of BK polyomavirus (BKV), urine samples were collected from Japanese-Americans in Los Angeles and from other southern Californians. Subtype I was the main subtype found in samples from both groups. The subtype I subgroup Ib-2, which is predominant in Europe, was the primary subgroup detected in second-generation Japanese-Americans and in southern Californians; however, the Ic subgroup prevalent in native Japanese was rare in these populations. Since the European subgroup (Ib-2) predominated in the studied geographic area, the findings demonstrate that transmission outside the family is common in the spread of BKV, unlike previous findings for JC polyomavirus.
Published ahead of print on 12 September 2007.
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